Constant-volume quantitative pouring method

The invention relates to a constant-volume quantitative pouring method, and belongs to the technical field of aluminum alloy casting. The method specifically comprises a quantitative container and a control system which are arranged in a heat preservation furnace body. The quantitative container is provided with a liquid inlet and a first liquid outlet, the heat preservation furnace body is provided with a second liquid outlet, and the liquid inlet is connected with the second liquid outlet. A piston rod is arranged in the quantitative container. When a quantitative liquid level sensor detectsthat the liquid level reaches the quantitative position H, the control system sends out an instruction signal, a pressure controller relieves the pressure of gas in the heat preservation furnace body, and when a thermocouple detects that the temperature of alloy melt meets the pouring temperature T, the control system sends out an instruction signal. The piston rod is lifted to open the first liquid outlet of the quantit